Even though it is clearly set up correctly, when I trigger it, about half the time, it leaves out a single letter - the "e" in "tom@tomkane.com". Not every time, mind you, and not consistently in any particular program, so I'm baffled.
I'm on a 2017 iMac, High Sierra 10.3.4, Safari.
Here is what is programmed in BetterTouch:
Screen grabs attached.
Here is the occasional result:
tom@tomkan.com